/* eslint-disable */
"use strict";
// eslint-disable
var QWebChannelMessageTypes = {
  signal: 1,
  propertyUpdate: 2,
  init: 3,
  idle: 4,
  debug: 5,
  invokeMethod: 6,
  connectToSignal: 7,
  disconnectFromSignal: 8,
  setProperty: 9,
  response: 10,
};

var QWebChannel = function (transport, initCallback) {
  if (typeof transport !== "object" || typeof transport.send !== "function") {
    console.error(
      "The QWebChannel expects a transport object with a send function and onmessage callback property." +
        " Given is: transport: " +
        typeof transport +
        ", transport.send: " +
        typeof transport.send
    );
    return;
  }
  var channel = this;
  this.transport = transport;

  this.send = function (data) {
    if (typeof data !== "string") {
      data = JSON.stringify(data);
    }
    channel.transport.send(data);
  };

  this.transport.onmessage = function (message) {
    var data = message.data;

    if (typeof data === "string") {
      data = JSON.parse(data);
    }
    switch (data.type) {
      case QWebChannelMessageTypes.signal:
        channel.handleSignal(data);
        break;
      case QWebChannelMessageTypes.response:
        channel.handleResponse(data);
        break;
      case QWebChannelMessageTypes.propertyUpdate:
        channel.handlePropertyUpdate(data);
        break;
      default:
        console.error("invalid message received:", message.data);
        break;
    }
  };

  this.execCallbacks = {};
  this.execId = 0;
  this.exec = function (data, callback) {
    if (!callback) {
      // if no callback is given, send directly
      channel.send(data);
      return;
    }
    if (channel.execId === Number.MAX_VALUE) {
      // wrap
      channel.execId = Number.MIN_VALUE;
    }

    if (Object.prototype.hasOwnProperty.call(data, "id")) {
      console.error(
        "Cannot exec message with property id: " + JSON.stringify(data)
      );
      return;
    }
    data.id = channel.execId++;
    channel.execCallbacks[data.id] = callback;
    channel.send(data);
  };

  this.objects = {};

  this.handleSignal = function (message) {
    // console.log("Signal", message);
    var object = channel.objects[message.object];
    if (object) {
      object.signalEmitted(message.signal, message.args);
    } else {
      console.warn(
        "Unhandled signal: " + message.object + "::" + message.signal
      );
    }
  };

  this.handleResponse = function (message) {
    if (!Object.prototype.hasOwnProperty.call(message, "id")) {
      console.error(
        "Invalid response message received: ",
        JSON.stringify(message)
      );
      return;
    }
    channel.execCallbacks[message.id](message.data);
    delete channel.execCallbacks[message.id];
  };

  this.handlePropertyUpdate = function (message) {
    for (var i in message.data) {
      var data = message.data[i];
      var object = channel.objects[data.object];
      if (object) {
        object.propertyUpdate(data.signals, data.properties);
      } else {
        console.warn(
          "Unhandled property update: " + data.object + "::" + data.signal
        );
      }
    }
    channel.exec({ type: QWebChannelMessageTypes.idle });
  };

  this.debug = function (message) {
    channel.send({ type: QWebChannelMessageTypes.debug, data: message });
  };
  channel.exec({ type: QWebChannelMessageTypes.init }, function (data) {
    for (const objectName in data) {
      // eslint-disable-next-line no-new
      new QObject(objectName, data[objectName], channel);
    }
    // now unwrap properties, which might reference other registered objects
    for (const objectName in channel.objects) {
      channel.objects[objectName].unwrapProperties();
    }
    if (initCallback) {
      initCallback(channel);
    }
    channel.exec({ type: QWebChannelMessageTypes.idle });
  });
};

function QObject(name, data, webChannel) {
  this.__id__ = name;
  webChannel.objects[name] = this;

  // List of callbacks that get invoked upon signal emission
  this.__objectSignals__ = {};

  // Cache of all properties, updated when a notify signal is emitted
  this.__propertyCache__ = {};

  var object = this;

  // ----------------------------------------------------------------------

  this.unwrapQObject = function (response) {
    if (response instanceof Array) {
      // support list of objects
      var ret = new Array(response.length);
      for (var i = 0; i < response.length; ++i) {
        ret[i] = object.unwrapQObject(response[i]);
      }
      return ret;
    }
    if (!response || !response["__QObject*__"] || response.id === undefined) {
      return response;
    }

    var objectId = response.id;
    if (webChannel.objects[objectId]) return webChannel.objects[objectId];

    if (!response.data) {
      console.error(
        "Cannot unwrap unknown QObject " + objectId + " without data."
      );
      return;
    }

    var qObject = new QObject(objectId, response.data, webChannel);
    qObject.destroyed.connect(function () {
      if (webChannel.objects[objectId] === qObject) {
        delete webChannel.objects[objectId];
        // reset the now deleted QObject to an empty {} object
        // just assigning {} though would not have the desired effect, but the
        // below also ensures all external references will see the empty map
        // NOTE: this detour is necessary to workaround QTBUG-40021
        var propertyNames = [];
        for (var propertyName in qObject) {
          propertyNames.push(propertyName);
        }
        for (var idx in propertyNames) {
          delete qObject[propertyNames[idx]];
        }
      }
    });
    // here we are already initialized, and thus must directly unwrap the properties
    qObject.unwrapProperties();
    return qObject;
  };

  this.unwrapProperties = function () {
    for (var propertyIdx in object.__propertyCache__) {
      object.__propertyCache__[propertyIdx] = object.unwrapQObject(
        object.__propertyCache__[propertyIdx]
      );
    }
  };

  function addSignal(signalData, isPropertyNotifySignal) {
    var signalName = signalData[0];
    var signalIndex = signalData[1];
    object[signalName] = {
      connect: function (callback) {
        if (typeof callback !== "function") {
          console.error(
            "Bad callback given to connect to signal " + signalName
          );
          return;
        }

        object.__objectSignals__[signalIndex] =
          object.__objectSignals__[signalIndex] || [];
        object.__objectSignals__[signalIndex].push(callback);

        if (!isPropertyNotifySignal && signalName !== "destroyed") {
          // only required for "pure" signals, handled separately for properties in propertyUpdate
          // also note that we always get notified about the destroyed signal
          webChannel.exec({
            type: QWebChannelMessageTypes.connectToSignal,
            object: object.__id__,
            signal: signalIndex,
          });
        }
      },
      disconnect: function (callback) {
        if (typeof callback !== "function") {
          console.error(
            "Bad callback given to disconnect from signal " + signalName
          );
          return;
        }
        object.__objectSignals__[signalIndex] =
          object.__objectSignals__[signalIndex] || [];
        var idx = object.__objectSignals__[signalIndex].indexOf(callback);
        if (idx === -1) {
          console.error(
            "Cannot find connection of signal " +
              signalName +
              " to " +
              callback.name
          );
          return;
        }
        object.__objectSignals__[signalIndex].splice(idx, 1);
        if (
          !isPropertyNotifySignal &&
          object.__objectSignals__[signalIndex].length === 0
        ) {
          // only required for "pure" signals, handled separately for properties in propertyUpdate
          webChannel.exec({
            type: QWebChannelMessageTypes.disconnectFromSignal,
            object: object.__id__,
            signal: signalIndex,
          });
        }
      },
    };
  }

  /**
   * Invokes all callbacks for the given signalname. Also works for property notify callbacks.
   */
  function invokeSignalCallbacks(signalName, signalArgs) {
    var connections = object.__objectSignals__[signalName];
    if (connections) {
      connections.forEach(function (callback) {
        callback.apply(callback, signalArgs);
      });
    }
  }

  this.propertyUpdate = function (signals, propertyMap) {
    // update property cache
    for (var propertyIndex in propertyMap) {
      var propertyValue = propertyMap[propertyIndex];
      object.__propertyCache__[propertyIndex] = propertyValue;
    }

    for (var signalName in signals) {
      // Invoke all callbacks, as signalEmitted() does not. This ensures the
      // property cache is updated before the callbacks are invoked.
      invokeSignalCallbacks(signalName, signals[signalName]);
    }
  };

  this.signalEmitted = function (signalName, signalArgs) {
    invokeSignalCallbacks(signalName, this.unwrapQObject(signalArgs));
  };

  function addMethod(methodData) {
    var methodName = methodData[0];
    var methodIdx = methodData[1];
    object[methodName] = async function () {
      var args = [];
      var callback;
      var result;
      for (var i = 0; i < arguments.length; ++i) {
        var argument = arguments[i];
        if (typeof argument === "function") callback = argument;
        else if (
          argument instanceof QObject &&
          webChannel.objects[argument.__id__] !== undefined
        ) {
          args.push({
            id: argument.__id__,
          });
        } else args.push(argument);
      }
      await new Promise((resolve) => {
        webChannel.exec(
          {
            type: QWebChannelMessageTypes.invokeMethod,
            object: object.__id__,
            method: methodIdx,
            args: args,
          },
          function (response) {
            if (response !== undefined) {
              result = object.unwrapQObject(response);
              if (callback) {
                callback(result);
              }
              resolve();
            }
          }
        );
      });
      return result;
    };
  }

  function bindGetterSetter(propertyInfo) {
    var propertyIndex = propertyInfo[0];
    var propertyName = propertyInfo[1];
    var notifySignalData = propertyInfo[2];
    // initialize property cache with current value
    // NOTE: if this is an object, it is not directly unwrapped as it might
    // reference other QObject that we do not know yet
    object.__propertyCache__[propertyIndex] = propertyInfo[3];

    if (notifySignalData) {
      if (notifySignalData[0] === 1) {
        // signal name is optimized away, reconstruct the actual name
        notifySignalData[0] = propertyName + "Changed";
      }
      addSignal(notifySignalData, true);
    }

    Object.defineProperty(object, propertyName, {
      configurable: true,
      get: function () {
        var propertyValue = object.__propertyCache__[propertyIndex];
        if (propertyValue === undefined) {
          // This shouldn't happen
          console.warn(
            'Undefined value in property cache for property "' +
              propertyName +
              '" in object ' +
              object.__id__
          );
        }

        return propertyValue;
      },
      set: function (value) {
        if (value === undefined) {
          console.warn(
            "Property setter for " +
              propertyName +
              " called with undefined value!"
          );
          return;
        }
        object.__propertyCache__[propertyIndex] = value;
        var valueToSend = value;
        if (
          valueToSend instanceof QObject &&
          webChannel.objects[valueToSend.__id__] !== undefined
        ) {
          valueToSend = { id: valueToSend.__id__ };
        }
        webChannel.exec({
          type: QWebChannelMessageTypes.setProperty,
          object: object.__id__,
          property: propertyIndex,
          value: valueToSend,
        });
      },
    });
  }

  // ----------------------------------------------------------------------

  data.methods.forEach(addMethod);

  data.properties.forEach(bindGetterSetter);

  data.signals.forEach(function (signal) {
    addSignal(signal, false);
  });

  for (const name in data.enums) {
    object[name] = data.enums[name];
  }
}

export default QWebChannel;
